In this video, we will introduce you to Flask, a powerful and lightweight web framework for building web applications with Python. Whether you're a beginner or an experienced developer, Flask is a great choice for developing small to medium-sized projects and prototyping.

Jinja2 and Flask work together in a template engine, a tool that accelerates the process of building web applications by dividing them into various sections. Templates also facilitate the reuse of identical HTML code in numerous locations, simplifying HTML handling. The template engine substitutes variables in a template file with their actual values, and then delivers the resultant HTML file to the client.

This video tutorial teaches how to create a menu for an online store using Flask and Jinja2. It covers the basics of routing in Flask, how to create a menu with links to different pages, and how to use the url_for function to generate URLs dynamically. The tutorial also explains the convention of naming the default page "index.html" and how it dates back to the early days of the web.